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    Contains implementations of the MqttClientPersistence interface.

    <p>
        An MQTT client needs a persistence mechanism to store messages while they
        are in the process of being delivered. This package contains several
        implementations of the interface.  If a persistence class is not
        specified on the constructor to an MQTT client,
        {@link org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence MqttDefaultFilePersistence}
        is used by default.

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